Error(s) in re-building vignettes:
--- re-building ‘OCR_with_imagerExtra.Rmd’ using rmarkdown
Loading required package: imager
Loading required package: magrittr

Attaching package: 'imager'

The following object is masked from 'package:magrittr':

    add

The following objects are masked from 'package:stats':

    convolve, spectrum

The following object is masked from 'package:graphics':

    frame

The following object is masked from 'package:base':

    save.image

dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'OCR_with_imagerExtra.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘OCR_with_imagerExtra.Rmd’

--- re-building ‘gettingstarted.Rmd’ using rmarkdown
Loading required package: imager
Loading required package: magrittr

Attaching package: 'imager'

The following object is masked from 'package:magrittr':

    add

The following objects are masked from 'package:stats':

    convolve, spectrum

The following object is masked from 'package:graphics':

    frame

The following object is masked from 'package:base':

    save.image

The computation stopped because the number of iteration reached maxiter.
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'gettingstarted.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘gettingstarted.Rmd’

--- re-building ‘treat_colorimage.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'treat_colorimage.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘treat_colorimage.Rmd’

SUMMARY: processing the following files failed:
  ‘OCR_with_imagerExtra.Rmd’ ‘gettingstarted.Rmd’
  ‘treat_colorimage.Rmd’

Error: Vignette re-building failed.
Execution halted